<PRE><B>Question 263724</B>
The Good Seed Flower Shop sells its own brand of fertilizer. It mixes one brand of fertilizer that contains 7% nitrogen with another than contains 8% nitrogen. The resulting mixture contains 7.7% nitrogen. How many pounds of the 7% fertilizer must be used to make 400 pounds of the 7.7% mixture

7%-------------------- 8%----------------mix 7.7%
x----------------------400-x-------------- 400 ----------- lbs


0.7x+0.8(400-x)=400*0.77
0.7x+320-0.8x=308

-0.1x=-12
x=120 

120--------------------380-----------------400     Answer


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